I never knew about the RSS. That's pretty nice.

I like the sound of promoting a random old thread. Different communities have different rules about whether it's okay to bring up old things so I tend to try and avoid it unless it's explicit that it's allowed (maybe it was and I just didn't see).

As others have mentioned, when thread frequency is already so low it doesn't seem sensible to add other ways to drive people away from reading one.

I'd probably prefer not to have categories of threads on the front page like there currently is as it just makes it harder to burrow through lots of past posts. There's search which is what I use to find things more finely than just wanting to explore, and I feel like most people here are interested enough in all the categories that having them isn't so necessary, but that could just be me.